Question No: 71 – (Topic 1)

A company wants to connect two data center sites using a hub-and-spoke design with 2000 remote sites. One design consideration is the requirement to transfer MPLS packets over the public Internet. In addition, one router at each site should be used, and the MPLS packets must be encapsulated inside IP packets because the public Internet cannot transfer native MPLS packets. Which feature can be used to simplify the network design?

GET VPN can be used to encrypt the MPLS packets with IPsec.

DMVPN can be used to build up GRE tunnels dynamically with MPLS encapsulation inside.

L2TPv3 can be used to encapsulate the MPLS packets.

Site-to-site IPsec without GRE can be used to encapsulate the MPLS packets.

PPPoE can be used to encapsulate the MPLS packets.

Answer: B

Question No: 72 – (Topic 1)

You are designing a network using multipoint GRE tunnels and need to be able to detect when connectivity between the GRE tunnel endpoints is broken. Which statement is true about configuring keepalives for multipoint GRE tunnels?

The keepalive timer values on the routers must have the same value.

Both routers must support GRE tunnel keepalives.

No configuration is required to detect when connectivity is broken between the GRE tunnel endpoints.

GRE tunnel keepalives will not detect when connectivity is broken between the GRE tunnel endpoints.

Answer: D

Question No: 73 – (Topic 1)

A data center provider has designed a network using these requirements:

->Two data center sites are connected to the public Internet.

->Both data centers are connected to different Internet providers.

->Both data centers are also directly connected with a private connection for the internal traffic, and public Internet traffic can also be routed at this direct connection.

->The data center provider has only one /19 public IP address block.

Under normal conditions, Internet traffic should be routed directly to the data center where the services are located. When one Internet connection fails, the complete traffic for both data centers should be routed by using the remaining Internet connection. In which two ways can this routing be achieved? (Choose two.)

The data center provider must have an additional public IP address block for this routing.

One /20 block is used for the first data center and the second /20 block is used for the second data center. The /20 block from the local data center is sent out with a low BGP weight and the /20 block from the remote data center is sent out with a higher BGP weight at both sites.

One /20 block is used for the first data center and the second /20 block is used for the second data center. The /20 block from the local data center is sent out without path prepending and the /20 block from the remote data center is sent out with path prepending at both sites.

One /20 block is used for the first data center and the second /20 block is used for the second data center. Each /20 block is only sent out locally. The /19 block is sent out at both Internet connections for the backup case to reroute the traffic through the remaining Internet connection.

One /20 block is used for the first data center and the second /20 block is used for the second data center. The /20 block from the local data center is sent out with a low BGP local preference and the /20 block from the remote data center is sent out with a higher BGP local preference at both sites.

BGP will always load-balance the traffic to both data center sites.

Answer: C,D

Question No: 74 – (Topic 1)

When you design a network, when would it be required to leak routes into a Level 1 area?

when a multicast RP is configured in the nonbackbone area

when MPLS L3VPN PE devices are configured in the Level 1 areas

when equal cost load balancing is required between the backbone and nonbackbone areas

when unequal cost load balancing is required between the backbone and nonbackbone areas

Answer: B

Question No: 75 – (Topic 1)

A company wants to use SSM as the multicast routing protocol inside its network. Some of its multicast applications do not support IGMPv3. In which two ways can the mapping be done when these applications send IGMPv2 join messages? (Choose two.)

The Layer 2 switches can send a request to a DNS server.

The Layer 3 multicast routers can send a request to a DNS server.

The mapping can be done statically at the Layer 2 switches.

The mapping can be done statically at the Layer 3 multicast routers.

The Layer 2 switches can transform the IGMPv2 join to an IGMPv3lite join.

The Layer 3 multicast routers can transform the IGMPv2 join to an IGMPv3lite join.

Answer: B,D

Question No: 76 – (Topic 1)

A network design shows two routers directly connected to an Ethernet switch using optical connections. There is an OSPF adjacency between the routers. In this design, which solution will ensure that interface down detection is reported as quickly as possible to the IGP?

optimized OSPF SPF timers

Bidirectional Forwarding Detection

automatic protection switching

optimized OSPF LSA timers

Ethernet OAM CFM monitoring

Answer: B

Question No: 77 – (Topic 1)

A company plans to include Nonstop Forwarding and Bidirectional Forwarding Detection as a part of their network redundancy plan. In which two ways do NSF and BFD work together when different hardware platforms are compared? (Choose two.)

During supervisor engine or routing engine failover, the NSF feature will always ensure that the BFD at the peer router will not trigger a link down independent of the used hardware platform.

At some hardware platforms, BFD and NSF are not supported together. During supervisor engine or routing engine failover, the BFD at the peer router will trigger a link down.

To ensure that BFD at the peer router will not trigger a link down during NSF, the BFD packets must be processed fast enough, and, during supervisor engine or routing engine failover, by processing the BFD independent from the supervisor engine or routing engine.

Because BFD is always processed at the line cards (not at the supervisor engine or routing engine), a supervisor engine or routing engine failover will not affect the BFD peer router.

Because BFD is always processed at the supervisor engine or routing engine, a supervisor engine or routing engine failover will always trigger a link down at the peer router.

Answer: B,C

Question No: 78 – (Topic 1)

A metro service provider is planning Resilient Ethernet Protocol for his backbone. Which two aspects must be considered before the network design is finalized? (Choose two.)

Two Resilient Ethernet Protocol segments can be connected redundantly at two points. One connection will be blocked, using the Spanning Tree Protocol defined in IEEE 802.1D.